10PCS M6X20Mm Knurled Clamping Knobs, round Head Male Thread Knurled Thumb Screw

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10PCS 1/4-20 Black Star Knobs, Threaded Knurled Thumb Nuts for Mechanical Instru

carbon Steel Knurled Thumb Screw High Type Hand Grip Knob M4 M5 M6

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8pcs M4 x 16mm Male Thread 14mm Head Knurled Knobs Thumb Screws Clamping Knobs

20 Pcs M4 x 10 mm Threaded Knurled Thumbscrew, Monitor Screws Vesa Mount

10PCS 1/4-20 Black Star Knobs, Threaded Knurled Thumb Nuts for Mechanisms